Lock



C., HFFMAN.

LOCK.

APPLICATION-FILED JULY I6,V 1920.

Patentod Aug. 23, 1921.

2 SHEETS-SHEET l.

Imam/tof:

C. HOFFMAN.

LOCK.

APPLICATION FILED JULY I6, 1920.

Patent/ad Aug. 23, 1921.

2 SHEETS-SHEET 2.

IIII

, IIN

PATENT OFFICE.

CARL HOFFMAN, 0F ALLENTOWN, PENNSYLVANIA.

Lock.`

Specification of Letters Patent.

Patented Aug. 2s, 1921.

Application led July 16, 1920. Serial No. 396,695. f

To all rwhom t may concern: y

Be it known that I, CARL HOFFMAN, of Allentown, in the county of Lehigh and State ot Pennsylvania, have invented certain new and useful Improvements in Locks; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable oth-ers skilled in the art to which it appertains to make and use the same.

My invention relates to locks and more especially to the type wherein the locking member also functions as a latching element, and the object of my invention is to provide a. simple and highly efficient device of the character stated in which the lock-latch may be operated from inside the door by a handle on the bolt operating spindle which is capable of being moved into and out of operating position and `of being locked in both positions; in which the lock-latch is `operable from outside th-e door by a key which must first `be `turned in' one direction to release the spring held bolt operating spindle so that it will come into a position to be turned by the key after the latter has been moved to actuate tumbler-s and an apertured plate through which the key must be inserted to reach the spindle; and in which the parts are placed in inoperative position by the key from the outside by first slightly turning the key so that its extreme end can pushthe spindle inwardly, bringing the bit of: the key into engagement with a stop to move it into the path of the spindle, and then by reverse movement of the key moving the tumblers and guard plate so that the spindle may not be reached except upon manipulation of the parts by a proper y key.

In the drawings, Figure 1 is a view in perspective oi a portion of a door audits casing with my improved lock applied, the

view being from inside the door. Fig. 2 is a horizontal sectional view ofthe lock. Fig. 3 shows the lock with part of the casing removed and discloses the guard plate actuating slide and the spindle stop. Fig. 4; is a perspective view `showing the guard plate, support, guard plate actuating slide, and tumblers, all in dismantled form. Fig. 5 is a face View of the lock-latch with its immediately related actuating members. Fig.,

ing and alt 2 the casing for the control mechanism, the casing being set within a cut out of the door 3 while the housing is attached to the door in known manner. fithin the housingr is a lock-latch which includes a locking member 4L attached to a plate 5 having the usual branches G which form the means to which power is Iapplied to move the lock-latch against the tension of a spring 7. The plate is also provided with a sec ond spring 8 by which the spindle 9 is normally maintained in operating position, the spring engaging a laterally extending arm 10 of the spindle. This arm `is adapted to fit in a cut out 12 of the plate 5 when. the spindle is moved to a non-operable position and the arm acts to effectively prevent any movement of the plate 5. In addition to this arm, the spindle has wings 13 for engaging the branches 6 of the plate 5 to move the latch. The exposed or outer end of the spindle has an operating handle 14: and adjacent this handle the spindle .is recessed as at 15, 16, to receive a locking pin 17, the spindle when drawn in and locked with the pin 17 in the recess 15, preventing any movement of the spindle into position to be cngaged by the key from the outside. With the pin 17 in the recess 16 the lock latch is prevented from movement because the spindle cannot be turned even though it may be reached by the key. At the other, or inner, end the spindle is kerfed, as at 1S to receive the flattened endV 19 of the key shank 20 by which the spindle is turned from outside the door.

The control mechanism within the casing 2 includes a support 30 of plate-like iform which is spaced from the lock-latch housing by an angular-ly disposed portion 31. The construction of this support forms a way for a guard plate 32 having an aperture 33 which in one position olf the plate is in alinement with the spindle 9, acccssto the spindle being through an aperture 33 ot the support 30. A second aperture 34 ofthe guard plate receives a stud 35 of an actuating slide 36, this stud projecting through a slot 37 in the support 30. The slide is adapted to be moved by the bit ot the key after tumblers 38 `have been dislodged from locking engagement with a post 39 on the slide, the tumblers having pivotal engagement with the support 30 which also carries a guiding projectiOIl 40 for the slide 36,

At 50 I have indicated a spindle stop. This stop is mounted for turning movement on a stud 51 projecting from the housingand it has a spindle engaging finger 52 and a key engaging finger 53, the latter being in a plane right angular to the finger 52. A prok jection 54 from the housing 2 limits the clockwise turning movement of the stop 53.

In the use of my improved lock, the locklatch may be readily withdrawn :from engagement with its keeper, as indicated in Fig. y2, by turning the handle 14, one of the wings 13 of the spindle engaging its complementary branches 6 to force the locklatch inwardly. Assuming itis desired to prevent access of the lock-latch from the elevate the guard plate 32 into the positionv vlatter inwardly against the tension of spring 8.v The key Visznow turned in an opposite direction andengaging the tumblers to move them from locking engagementV with the slide 36 actuates the latter by contactwith its" talons 60. Movement of this slide will where its aperture 33 is outl of line with the key spindle, as indicated in dotted lines, Fig. 3. Thekey is then withdrawn from the lockgf It will be seen that with the control mechanism in the position stated the spindle of the lock-latch cannot be reached except f by appropriate key, Even though ak key ture 33 into alinement with the spindle 9.. v l The key may now be ,farther inserted and its r5.0

may lbeinserted andthe tumblers actuated the Yspindle is still out of reach and will refmain so until the stop 5() is actuated to reflease the spindle. In the proper actuation of the parts from the outside the key is first turned so as to turn the stop 50 to release the spindle, is then given a reverse turn to engage the tumblers and actuate the slide 36 to move the guard plate 32 and bringits aperflattened end 19will fit in the kerfed end of thel spindle. Turning of the key will retract l vthe lock-latch.

The advantages of my invention will be y apparent. It will be appreciated, that I have provided a simple mechanism whereby a door is. effectively locked and which requires 1n add1t1on to the appropriate key a certain maneuvering of therkey in the lock to bring the partsfinto operative position.

I claim as my invention 11A door 'lock including a spring tensloned lock-latch, an actuating spindle there for, a handle for operating said spindle fromV inside the door, said spindle beinguoperable by a key from outside the door, means for controlling access to said spindle, and key actuated means for actuating said last mentioned means.

2. A door lock including a spring tensioned lock-latch, an actuating spindle therefor, a handle for operating said spindle from inside the door, said spindle being 0perable by a key from outside the door, a guard lplate having an aperture through which the key must be projected to engage said spindle, and a tumbler controlled actuating slide to shift said late.

3. A door lock inclu ing a spring tensioned lock-latch, a rotatable and longitudinally movable actuating spindle therefor, a handle for operating said spindle from inside the door, said spindle being operable by a key from outside the door, a guard plate having an aperture through which the key must be projected to enga e said spindle, a key operated stop for olding said spindle at the limit of its inward longitudinal movement and out of key-engaging p0- sition, and a tumbler controlled actuatln slide for moving said guard plate into osition to aline its aperture with said spindle.

4. A door lock including a spring tensioned lock-latch, a rotatable and longitudinally movable actuating spindle therefor, a spring for maintaining said Spindle at 011B limit of its longitudinal movement, a handle for operating said spindle from inside the door, said spindle being. operable by a key from outside the door, a guard late having an aperture through which the ey must be projected to engage said spindle, a rotatable stop for holding said spindle against the YVtension of its spring and out of key-engaging position, said stop having a key e aging portion by vwhich it may be movl to operative and inoperative position, and a tumbler controlled actuatin slide for moving said guard plate to aline its aperture with said spindle.

v5. A door lock includin a spring tensioned lock-latch, a rotatab e and longitudinally movable actuating spindle therefor, a spring for maintaining said spindle at one limit of its longitudinal movement, a handle at one end of said spindle for operating it from inside the door, said spindle having a kerl? in its opposite end, a guard plate having an aperture which in one position of the plate is in alinement with said kerfed end of the spindle, a rotatable stop for holding said spindle against the tension of its s ring, and a tumbler controlled actuating slide for moving said guard plate to aline its aperture with said spindle, in combination with 'a key for moving said spindle stop, actuating .said tumbler controlled slide, and engaging said spindle to retract said locklatch.

6. A door lock including a sp tensioned lock-latch, a rotatable and lblrxilgitudinally movable actuating spindle therefor, a spring for maintaining said spindle at one limit of its longitudinal movement, a handle at oney end of said spindle for operating it from inside the door, said spindle having a lierf in its opposite end, a guard plate having an aperture which in one position of the plate is in alinement with said kerfed end of the spindle, a rotatable stop for holding said spindle against the tension of its spring, a tumbler controlled actuating slide for movingfsaidguard plate to aline its aperture with said spindle, and a stop pin for engaging said spindle to lock it against rotatable and longitudinal movement, in oombination with a key for moving said spindle stop, actuating said tumbler controlled slide, and engaging said spindle to retract said lock-latch.

7. A door lock including a spring tensioned lock-latch, having a cutl away portion, a rotatable and longitudinally movable actuating spindle therefor, a laterally tending arm on said spindle adapted to be moved into said cut away portion to hold said lock latch against movement, a spring for maintaining said spindle at one limit of its longitudinal movement and its arm free of said cut away portion, a handle at one end of said spindle for operating it from inside the door, said spindle having a kerf in its opposite end, a guard plate having an aperture which in one position of the plate is in alinement with said kerfed end of the spindle, a rotatable stop for holding said spindle against the tension of its spring and said arm in the cut away portion of said lock latch, and a tumbler controlled actuating slide for moving said guard plate to aline its aperture with said spindle, in combination with a key for moving said spindle stop, actuating said tumbler controlled slide, and engaging said spindle to retract said lock-latch.

In testimony whereof I have signed this application.

CARL HOFFMAN. 

